ParamsUtil.java

package com.wb.sc.util;

import com.common.format.ByteHelper;
import com.common.format.HexStringBytes;
import com.wb.sc.app.SCApp;
import com.wb.sc.bean.BaseBean;
import com.wb.sc.security.RSA;

public class ParamsUtil {
	
	public static final String ITEMS_DIVIDER = "-\\|";
	public static final String ITEM_DIVIDER = "-@";
	public static final String ITEM_IMG_DIVIDER = "-#";
	public static final String ITEMS_DIVIDER_LINE = "\\|";
	
	/**
	 * 
	 * @描述: 封装请求参数
	 * @param value 字段的值
	 * @param length 字段在接口文档中定义的长度
	 * @return
	 */
	public static String getReqParam(String value, int length) {
		if(value == null) value = "";
		return value + "&" + length;
	}
	
	/**
	 * 
	 * @描述: 封装请求参数, 并进行RSA加密
	 * @param value
	 * @param length
	 * @return
	 */
	public static String getReqRsaParam(String value, int length) {
		if(value == null) value = "";
		RSA rsa = new RSA();
		try {
			byte[] psd = rsa.encryptByPublicKey(SCApp.getInstance().getPublicKey(), 
					value.getBytes());
			return getReqHexParam(HexStringBytes.bytes2HexString(psd), length);
		} catch (Exception e) {
			e.printStackTrace();
		}	
		
		return "";
	}
	
	
	public static String getReqHexParam(String value, int length) {
		if(value == null) value = "";
		return value + "&" + length + "&" + "Hex";
	}
	
	public static String getReqIntParam(int value, int length) {
		byte[] bLocalArr = new byte[length];
	    for (int i = 0, j=length-1; (i < 4) && (i < length); i++, j--) {
	        bLocalArr[j] = (byte) (value >> 8 * i & 0xFF);
	    }
	    return getReqHexParam(HexStringBytes.bytes2HexString(bLocalArr), length);
	}
	
	/**
	 * 
	 * @描述: 获取响应字段中的参数，并自动下移指针位置
	 * @param baseBean
	 * @param length
	 * @return
	 */
	public static String getRespParamNext(BaseBean baseBean, int length) {
		byte[] paramBytes = ByteHelper.byteArraySub(baseBean.dataBytes, baseBean.position, length);
		baseBean.position += length;
		return new String(paramBytes).trim();
	}
	
	/**
	 * 
	 * @描述: 获取响应字段中的整形值，并自动下移指针位置
	 * @param baseBean
	 * @param length
	 * @return
	 */
	public static int getRespIntParamNext(BaseBean baseBean, int length) {
		byte[] paramBytes = ByteHelper.byteArraySub(baseBean.dataBytes, baseBean.position, length);
		baseBean.position += length;
		
		int value = 0;
		int j=0;
		for(int i=paramBytes.length-1; i>0; i--) {
			value += (paramBytes[i]&0xff)<<(8*j);
			j++;
		}
		
		return value;
	}
	
	/**
	 * 
	 * @描述: 获取响应字段中的指定参数
	 * @param baseBean
	 * @param start
	 * @param length
	 * @return
	 */
	public static String getRespParam(BaseBean baseBean, int start, int length) {
		byte[] paramBytes = ByteHelper.byteArraySub(baseBean.dataBytes, start, length);
		return new String(paramBytes).trim();
	}
	
	/**
	 * 
	 * @描述: 获取是否有下一页标志
	 * @param baseBean
	 * @return
	 */
	public static boolean getNextPageFlag(BaseBean baseBean) {
		boolean hasNextPage = false;
		char flag = (char)baseBean.dataBytes[baseBean.dataBytes.length-1];
		if(flag == '1') {
			hasNextPage = true;
		}
		return hasNextPage;
	}
}